Which phobia involves a fear of speaking in public?

The correct answer, which is glossophobia, specifically refers to the intense fear or anxiety associated with public speaking. This phobia can manifest in various ways, including sweating, trembling, rapid heartbeat, and an overwhelming desire to avoid situations where one must speak in front of others. It is one of the most common social phobias and can significantly impact an individual's personal and professional life.

The other choices focus on different phobias: germophobia pertains to an irrational fear of germs and contamination; xenophobia involves fear or prejudice against people from other countries or cultures; and agoraphobia is primarily the fear of being in situations where escape might be difficult. Each of these terms highlights different aspects of anxiety and fear but does not relate specifically to the fear of speaking in public, which is distinctly characterized by glossophobia.